1g1x

STRUCTURE OF RIBOSOMAL PROTEINS S15, S6, S18, AND 16S RIBOSOMAL RNA

Method: X-RAY DIFFRACTION

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1. Protein Identity and Related Structures Protein Identity & Related Structures

30S RIBOSOMAL PROTEIN S6

OrganismNot specified

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–RNA	Heteromer	Protein 3 RNA 2	16S RIBOSOMAL RNA × 1 16S RIBOSOMAL RNA × 1 30S RIBOSOMAL PROTEIN S15 × 1 （Q5SJ76） 30S RIBOSOMAL PROTEIN S18 × 1 （Q5SLQ0）	Consistent with all polymers
2	Protein–RNA	Heteromer	Protein 3 RNA 2	16S RIBOSOMAL RNA × 1 16S RIBOSOMAL RNA × 1 30S RIBOSOMAL PROTEIN S15 × 1 （Q5SJ76） 30S RIBOSOMAL PROTEIN S18 × 1 （Q5SLQ0）	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RS6_THET8
Isoform	—
PDB entities	3
Chains and sequence ranges	Author chain A； PDBConstruct 1–98； UniProt 1–98 Author chain F； PDBConstruct 1–98； UniProt 1–98

30S RIBOSOMAL PROTEIN S15

OrganismNot specified

UniProt Q5SJ76

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–RNA	Heteromer	Protein 3 RNA 2	16S RIBOSOMAL RNA × 1 16S RIBOSOMAL RNA × 1 30S RIBOSOMAL PROTEIN S6 × 1 （Q5SLP8） 30S RIBOSOMAL PROTEIN S18 × 1 （Q5SLQ0）	Consistent with all polymers
2	Protein–RNA	Heteromer	Protein 3 RNA 2	16S RIBOSOMAL RNA × 1 16S RIBOSOMAL RNA × 1 30S RIBOSOMAL PROTEIN S6 × 1 （Q5SLP8） 30S RIBOSOMAL PROTEIN S18 × 1 （Q5SLQ0）	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RS15_THET8
Isoform	—
PDB entities	4
Chains and sequence ranges	Author chain B； PDBConstruct 1–88； UniProt 1–78 Author chain G； PDBConstruct 1–88； UniProt 1–78

30S RIBOSOMAL PROTEIN S18

OrganismNot specified

UniProt Q5SLQ0

State in the Current Structure

Assembly	Physical composition	Protein state	Molecular copy count	Associated components	Data consistency
1	Protein–RNA	Heteromer	Protein 3 RNA 2	16S RIBOSOMAL RNA × 1 16S RIBOSOMAL RNA × 1 30S RIBOSOMAL PROTEIN S6 × 1 （Q5SLP8） 30S RIBOSOMAL PROTEIN S15 × 1 （Q5SJ76）	Consistent with all polymers
2	Protein–RNA	Heteromer	Protein 3 RNA 2	16S RIBOSOMAL RNA × 1 16S RIBOSOMAL RNA × 1 30S RIBOSOMAL PROTEIN S6 × 1 （Q5SLP8） 30S RIBOSOMAL PROTEIN S15 × 1 （Q5SJ76）	Consistent with all polymers

Other States of the Same Protein in the Database

View Construct and Data Evidence

UniProt name	RS18_THET8
Isoform	—
PDB entities	5
Chains and sequence ranges	Author chain C； PDBConstruct 1–88； UniProt 1–87 Author chain H； PDBConstruct 1–88； UniProt 1–87

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	1g1x
Deposition date deposition_date	2000-10-13
Structure title title	STRUCTURE OF RIBOSOMAL PROTEINS S15, S6, S18, AND 16S RIBOSOMAL RNA
Keywords keywords	ribosomal proteins S15, S6, S18, S30 ribosomal subunit, RNA, ribosome; RIBOSOME
Experimental Method method	X-RAY DIFFRACTION

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3. Official assembly/model SAXS Official SAXS Profiles

This page reads only the latest assembly calculations. Every curve maps to an explicit PDB entry, official biological assembly and coordinate model.

1g1x__assembly_2__model_1

Assembly 2 · Model 1 · CRYSOL 4.1.3-1-20251215 (887e7ef)

Download this curve (.dat)

1g1x__assembly_2__model_1 | I(q)

100 plotted points; both axes use logarithmic scales.

1g1x__assembly_2__model_1 | P(r) · Pending

P(r) will be calculated and displayed separately for the same assembly/model.

Rg（Guinier）	26.82 Å
Rg (electron density)	26.90 Å
Total Rg	27.34 Å
Atom count	3790
Residues	319
Excluded volume	60831 Å³
Maximum q	0.500 Å⁻¹

Assembly	Model	Structure unit	Oligomeric description	Status	CRYSOL	Actions
1	1	`1g1x__assembly_1__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download
2	1	`1g1x__assembly_2__model_1`	pentameric （5）	Success	4.1.3-1-20251215 (887e7ef)	View Download

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4. Crystallography and Experiment 4. Crystallography & Experiment

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5. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Description description	16S RIBOSOMAL RNA
Molecular weight formula_weight	13576.2 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polyribonucleotide
Chain IDs strand_id	D,I
Atom count atom_count	7543

AAGGCGGCCGAAAGGCUAGACGGUGGGAGAGGGUGGUGGAA

Entity 2 Entity 2 polymer

Description description	16S RIBOSOMAL RNA
Molecular weight formula_weight	14102.4 kDa
Source method src_method	syn
Copy count entity_count	2

Polymer Polymer

Polymer type type	polyribonucleotide
Chain IDs strand_id	E,J

ACGCCGAUGGCGAAGGCAGCCACCUGGUCCACCCGUGACGCUUU

Entity 3 Entity 3 polymer

Description description	30S RIBOSOMAL PROTEIN S6
Molecular weight formula_weight	11732.5 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A,F

MRRYEVNIVLNPNLDQSQLALEKEIIQRALENYGARVEKVEELGLRRLAYPIAKDPQGYFLWYQVEMPEDRVNDLARELRIRDNVRRVMVVKSQEPFL

Entity 4 Entity 4 polymer

Description description	30S RIBOSOMAL PROTEIN S15
Molecular weight formula_weight	10491.2 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	B,G

PITKEEKQKVIQEFARFPGDTGSTEVQVALLTLRINRLSEHLKVHKKDHHSHRGLLMMVGQRRRLLRYLQREDPERYREIVEKLGLRG

Entity 5 Entity 5 polymer

Description description	30S RIBOSOMAL PROTEIN S18
Molecular weight formula_weight	10244.3 kDa
Source method src_method	nat
Copy count entity_count	2

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,H

MSTKNAKPKKEAQRRPSRKAKVKATLGEFDLRDYRNVEVLKRFLSETGKILPRRRTGLSGKEQRILAKTIKRARILGLLPFTEKLVRK

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6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

Domain ID domain_id	d1g1xa_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.14 — Ribosomal protein S6
Family Family family	d.58.14.1 — Ribosomal protein S6

Domain ID domain_id	d1g1xb_
Class class	a — All alpha proteins
Fold Fold fold	a.16 — S15/NS1 RNA-binding domain
Superfamily Superfamily superfamily	a.16.1 — S15/NS1 RNA-binding domain
Family Family family	a.16.1.2 — Ribosomal protein S15

Domain ID domain_id	d1g1xc_
Class class	a — All alpha proteins
Fold Fold fold	a.4 — DNA/RNA-binding 3-helical bundle
Superfamily Superfamily superfamily	a.4.8 — Ribosomal protein S18
Family Family family	a.4.8.1 — Ribosomal protein S18

Domain ID domain_id	d1g1xf_
Class class	d — Alpha and beta proteins (a+b)
Fold Fold fold	d.58 — Ferredoxin-like
Superfamily Superfamily superfamily	d.58.14 — Ribosomal protein S6
Family Family family	d.58.14.1 — Ribosomal protein S6

Domain ID domain_id	d1g1xg_
Class class	a — All alpha proteins
Fold Fold fold	a.16 — S15/NS1 RNA-binding domain
Superfamily Superfamily superfamily	a.16.1 — S15/NS1 RNA-binding domain
Family Family family	a.16.1.2 — Ribosomal protein S15

Domain ID domain_id	d1g1xh_
Class class	a — All alpha proteins
Fold Fold fold	a.4 — DNA/RNA-binding 3-helical bundle
Superfamily Superfamily superfamily	a.4.8 — Ribosomal protein S18
Family Family family	a.4.8.1 — Ribosomal protein S18

CATH v4.4 (6 domains)

Domain ID domain_id	1g1xA00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	60 — Ribosomal protein S6/Translation elongation factor EF1B

Domain ID domain_id	1g1xB00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	10 — S15/NS1, RNA-binding

Domain ID domain_id	1g1xC00
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	640 — 30s Ribosomal Protein S18
Homologous superfamily homologous superfamily	10 — Ribosomal protein S18

Domain ID domain_id	1g1xF00
Class class	3 — Alpha Beta
Architecture architecture	30 — 2-Layer Sandwich
Topology topology	70 — Alpha-Beta Plaits
Homologous superfamily homologous superfamily	60 — Ribosomal protein S6/Translation elongation factor EF1B

Domain ID domain_id	1g1xG00
Class class	1 — Mainly Alpha
Architecture architecture	10 — Orthogonal Bundle
Topology topology	287 — Helix Hairpins
Homologous superfamily homologous superfamily	10 — S15/NS1, RNA-binding

Domain ID domain_id	1g1xH00
Class class	4 — Few Secondary Structures
Architecture architecture	10 — Irregular
Topology topology	640 — 30s Ribosomal Protein S18
Homologous superfamily homologous superfamily	10 — Ribosomal protein S18

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Unit-cell length a length_a	169.500 Å
Unit-cell length b length_b	169.500 Å
Unit-cell length c length_c	113.800 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	120.00 °
Molecules per unit cell Z z_pdb	12

Space group space_group	P 65
Space-group number int_tables_number	170
Crystal system crystal_system	—

Resolution resolution	2.600 Å
Low-resolution limit resolution_low	50.000 Å
R factor r_factor	—
R_work r_work	0.2660
R_free r_free	0.2980

STRUCTURE OF RIBOSOMAL PROTEINS S15, S6, S18, AND 16S RIBOSOMAL RNA

1. Protein Identity and Related Structures Protein Identity & Related Structures

30S RIBOSOMAL PROTEIN S6

State in the Current Structure

Other States of the Same Protein in the Database

30S RIBOSOMAL PROTEIN S15

State in the Current Structure

Other States of the Same Protein in the Database

30S RIBOSOMAL PROTEIN S18

State in the Current Structure

Other States of the Same Protein in the Database

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

1g1x__assembly_2__model_1

1g1x__assembly_2__model_1 | I(q)

1g1x__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)

STRUCTURE OF RIBOSOMAL PROTEINS S15, S6, S18, AND 16S RIBOSOMAL RNA

1. Protein Identity and Related Structures Protein Identity & Related Structures

30S RIBOSOMAL PROTEIN S6

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

30S RIBOSOMAL PROTEIN S15

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

30S RIBOSOMAL PROTEIN S18

State in the Current Structure

Other States of the Same Protein in the Database

Monomer

Homodimer

Homotetramer

Other homooligomers

Heteromeric or nucleic-acid complex

2. Structure Basics 2. Structure Basics

3. Official assembly/model SAXS Official SAXS Profiles

1g1x__assembly_2__model_1

1g1x__assembly_2__model_1 | I(q)

1g1x__assembly_2__model_1 | P(r) · Pending

4. Crystallography and Experiment 4. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

Refinement Refinement

Diffraction experiment Diffraction

5. Entities and Polymers Entities & Polymers (5)

Entity 1 Entity 1 polymer

Polymer Polymer

Entity 2 Entity 2 polymer

Polymer Polymer

Entity 3 Entity 3 polymer

Polymer Polymer

Entity 4 Entity 4 polymer

Polymer Polymer

Entity 5 Entity 5 polymer

Polymer Polymer

6. Fold Classification (SCOP + CATH) 12 domains

SCOP 2.08 (6 domains)

CATH v4.4 (6 domains)

7. Citations (1)